Attention to the gearbox industry! The drive system reducer in the mixing industry has been replaced by a permanent magnet synchronous motor

Release Time：

2024-09-02

Permanent magnet motors were included in the "Recommended Catalogue of Energy saving Electromechanical Equipment (Products) (Sixth Batch)" by the Ministry of Industry and Information Technology in November 2015 due to their advantages of simple structure, small size, light weight, high efficiency, high power factor, high starting torque, and wide economic operating range. They are currently a key product in the promotion of energy-saving new technologies. In recent years, many high-end motors have emerged in the permanent magnet synchronous motor body, such as six phase permanent magnet synchronous motors. Using it to provide power for ships, its volume is nearly 60% smaller than traditional DC motors, and losses are reduced by nearly 20%; The maximum installed capacity of permanent magnet synchronous motors used for ship propulsion is 38MW; China has developed a 3MW high-speed permanent magnet wind turbine. The current permanent magnet synchronous motor is developing towards a larger speed range and higher precision control, and high-performance permanent magnet materials are favored. But in the reducer industry, with the development of permanent magnet motors, there is indeed a sense of panic and fear. The reason is that there are always voices of permanent magnet motors replacing reducers. Today, we will take a look at some relevant situations of permanent magnet motors replacing reducers in the industry:

The drive system reducer in the mixer industry has been replaced

In the traditional mechanical equipment of the mixing industry, the drive system composed of asynchronous motors and mechanical reduction mechanisms dominates, but it has disadvantages such as complex structure, large moment of inertia, low overall system efficiency, high noise, lubricating oil mixer leakage pollution, and frequent maintenance

It is almost impossible for traditional mixers to be directly driven by asynchronous motors without reducers. This is because when asynchronous motors run at low speeds, the number of pole pairs in the motor will correspondingly increase. At this time, the proportion of excitation current in the motor is large, resulting in a high no-load current and low efficiency and power factor of the motor.

So replacing the drive motor of the mixer with a permanent magnet synchronous motor will solve the above problems. Due to the fact that the excitation of permanent magnet synchronous motors is generated by permanent magnets and does not require additional excitation current from the stator, the power factor of permanent magnet synchronous motors can be achieved very high. At the same time, due to the extremely low reactive power component of the stator current, its value is significantly lower than that of induction motors with the same number of poles and capacity, especially when there are many poles in the motor, which can reduce stator copper loss by 30% to 50%. Permanent magnet synchronous motors are easy to achieve multiple poles and have good efficiency and power factor characteristics over a wide load range, making it possible to eliminate mechanical reducers and achieve direct drive of low-speed high torque motors.